Typographic mold



Aug. l2, 1952 M, H HARTZELL 2,606,649

TYPOGRAPHIC MOL D Filed June 9, 1948 lima l l num?L xllII Wulmstkilmlk l5 IO 28 l5 32 FIG. 4

I INVENTOR.

M. H. HARTZELL ATTORNEY Patented Aug. 12, 1952 UNITED STATES PATENT OFFICE TYPOGRAPHIC MOLD Maurice H. Hartzell, Chester, Pa.

Application June 9, 1948, Serial No. 31,890

9 Claims. 1

This invention relates to printing and more particularly to a mold in which slugs or spacing members may be cast from molten material such as lead, and this application is a continuation in part of copending application Serial No. 650,029 filed February 25, 1946, and abandoned on June 12, 1948.

Molds of this type have not been entirely satisfactory, due to the fact that there was a tendency for the cast slug or spacer to stick or jam in the mold when being ejected by the slidable mold blade. This sticking was caused by the fact that the walls of the mold cavity were slightly bowed outwardly rather than being straight, which resulted in the slugs taking the shape of this bowed cavity and thus caused sticking or jamming upon movement of the slug out of the cavity.

The bowed walls of the mold cavity were caused by the use of a point block between one end of the cheek pieces having a greater thickness than the point block between the opposite ends of the cheek pieces. Since the side faces of these point blocks were parallel the bolting together of the cheek pieces against these faces resulted in bowing or bending the walls of the mold cavity.

The prior art devices are further open to the objection that it would be very difficult if not impossible to properly lubricate the slidable mold blade since these devices provided a single oil channel leading from the exterior to the bottom of the slideway receiving the mold blade and consequently a dead end pocket resulted which effectively prevented the proper flow of oil through the oil channel which precludes sufficient lubrication to prevent sticking of the blade.

It is therefore an object of this invention to provide a slug mold in which means is incorporated to prevent curving or bowing of the mold cavity walls and at the same time to provide the necessary clearance or draft in order to facilitate the ejection of the cast slugs and to also permit free sliding movement of the mold blade.

A further object of this invention is the provision of a slug mold in which means is provided to insure that mold blade will be properly lubricated and thus prevent binding or sticking thereof during operation.

Further objects and advantages of the invention will be apparent from the following specilication taken in conjunction with the accompanying drawings, wherein:

Fig. 1 is an exploded perspective View showing the parts comprising this invention in the relative positions which they occupy upon assembly thereof;

Fig. 2, a side elevation of the parts of Fig. 1 in assembled relationship;

Fig. 3, a top plan View of the slug mold of Fig. 2;

Fig. 4, a sectional view taken on the line 4-4 of Fig. 2; and

Fig. 5, an elevational view with parts in section for greater clarity and showing the mold installed in a casting machine, the associated parts of the casting machine being shown in phantom.

With continued reference to the drawings, there is shown in Fig. 1 the parts which are used to make up the slug mold of this invention. These parts comprise front and rear cheek pieces I and II, respectively, right point block I2 left point block I3 and mold blade I4. These parts are brought into assembled relationship as shown in Figs. 2 and 3 by the application of screw threaded fastening means or the like I5 passing through apertures I6 in the front c-heek piece, apertures Il in the right and left point blocks and screw threaded apertures I8 in the rear cheek piece. It will be obvious that these screw threaded fasteners serve to bind the cheek pieces and point blocks disposed therebetween tightly together, thus providing a channel below the point blocks for the reception of mold blade I4.

The front and rear cheek pieces are provided with upstanding end portions I9 and 20 resulting in central depressed portions 2| and 22, respectively. The channel between the cheek pieces and beneath the depressed portions 2I and 22 provides a mold cavity 23.

In order to provide sufficient clearance or draft in the mold cavity 23 to permit the free ejection of cast slugs therefrom the point blocks I2 and I3 are tapered as shown in Fig. 3 whereby the mold cavity 23 is tapered outwardly from left to right as viewed therein. The taper of the point blocks and of the mold cavity is exaggerated in Fig. 3 in order to more clearly show the application of the principle of this invention. As will be seen from an inspection of Fig. 3, the right point block I2 has a greater average thickness than that of the left point block I3, and since the same taper is provided on both of these blocks when the cheek pieces I0 and II are clamped tightly against the tapered surfaces thereof, the resulting mold cavity 23 will have perfectly straight tapered walls with no curve or bowing thereof which permits the free ejection of cast slugs therefrom.

Since the channel 24 which receives the mold blade I 4 is tapered by reason of the tapered point blocks I2 and I3, it is necessary to make provision for the free sliding of the blade I4 therein and at the same time to provide a sufficient bearing surface for the side walls of the blade in order to prevent lateral movement or rocking thereof. This has been accomplished by relieving or tapering the inner wall of the rear cheek piece from a point adjacent the left end of the mold cavity to the left end of the cheek piece. The amount of material removed in the relieving operation is determined by the degree of taper of the point blocks l2 and i3 and is suicient to provide parallel walls between the front and rear cheek pieces from the left end of the mold cavity to the left end of the cheek pieces. rlhis relief is shown by a dotted line at 26 in Fig. 3 and may be seen in the perspective of the surface 25 in Fig. 1. While normally the relief surface 25 is provided only on the rear cheek piece it is obvious that either or both front and rear cheek pieces may be relieved a sufficient amount to provide for the proper bearing surface and free movement of the mold blade I4.

Since the slug mold of this invention is subjected to considerable heat and consequent expansion and distortion of the parts, it is necessary to provide suitable means for lubricating the mold blade i4 in order to prevent sticking or binding thereof in the channel 24. This has been accomplished by providing a transverse oil receiving channel 2l in the upper surface of front and rear cheek pieces |8 and il adjacent the left hand end -thereof. this transverse oil channel are inclined oil channels 28 on the inner surface of the front and rear cheek pieces which provide for the passage of oil from top to bottom of the mold. In order to distribute the oil along the length of the channel 24, the mold blade I4 is provided in the bottom surface thereof with a lateral channel or groove 29 which serves to pick up and carry along therewith a quantity of oil each time the channel 29 passes channels 28.

In order to prevent the creation of a back pressure in channels 28 due to the heat normally present in the mold, there has been provided in the bottom surface of each of the front and rear cheek pieces IB and lateral channels 3|) and 3 l respectively, communicating with channels 28 and on the outer surface of the front and rear cheek pieces HJ and there has been provided upwardly extending inclined channels 32 and 33 communicating with lateral channels 3f! and 3|. lt will thus be seen that the provision of lateral channels 38 and 3| and upwardly extending channels 32 and 33 results in venting the lateral channel 29 in blade |4 whereby back pressure will not build up resulting in the free flow of oil in channel 28 whereby the blade I4 may be properly and easily lubricated.

In operation, the slug mold is clamped in a casting machine as shown in Fig. 5 in which the blocks 34 and 35 shown in phantom serve to securely locate the mold in position. Matrix 36 engages the top surface 3l of the depressed portions 2| and E2 in the front and rear cheek pieces thus serving to close mold cavity 23. An ejection nozzle 33 is disposed adjacent the lower open side of the mold cavity i3 and serves to inject molten lead or other suitable material thereinto. Upon solidication of the molten material in the mold cavity 23, the mold blade Hi is reciprocated therein to eject the cast slug therefrom. Since the walls of the mold cavity 23 are perfectly straight and are provided with a taper or draft the Vslug may be easily ejected therefrom with no danger of sticking or jamming.

It will be apparent from the above that there Communicating with 4 has been provided by this invention a simple, economical and eicient means whereby the difficulties heretofore experienced in slug molds of this type have been overcome and in which the cast slugs may be easily ejected therefrom without jamming or sticking and without damage to the slugs, and in which means is provided to insure the proper lubrication of the slidable mold blade.

It will be obvious to those skilled in the art that various changes may be made in the invention without departing from the spirit and scope thereof and therefore the invention is not limited by that which is shown in the drawing and described in the specification but only as indicated in the appended claims.

What is claimed is:

l. In a slug mold for use in casting machines, front and rear cheek pieces, tapered right and left point blocks secured between the ends of said cheek pieces, the right point block being oi greater average thickness than the left point block thus providing a tapered mold cavity having straight sides, a mold blade receiving -channel between said cheek pieces and below said point blocks, a mold blade slidably received in said channel, a wall of said channel being relieved from a point adjacent one end of the mold cavity to the adjacent end of the cheek pieces thus providing parallel bearing surfaces for said mold blade whereby said mold blade is supported for free sliding movement in said channel, inclined oil grooves in the inner surfaces of said cheek pieces, laterally disposed grooves in the bottom surfaces of said cheek pieces and communicating with said oil grooves and inclined vent grooves in the outer surfaces of said cheek pieces communieating with said lateral grooves whereby the oil receiving space is vented to the atmosphere thus providing for proper lubrication of said mold blade.

2. In a slug mold for use in casting machines, front and rear cheek pieces, tapered point blocks secured between said cheek pieces, one of said point blocks being of greater average thickness than the other thus providing a tapered mold cavity, a mold blade receiving channel between said cheek pieces, a mold blade slidably received in said channel, a wall of said channel being relieved thus providing parallel bearing surfaces for said mold blade whereby said mold blade is supported for free sliding movement in said channel, oil grooves in the inner surfaces of said cheek pieces, laterally disposed grooves in the bottom surfaces of said cheek pieces and communicating with said oil grooves, vent grooves in the outer surfacesof said cheek pieces communicating with said lateral grooves whereby the oil receiving space is vented thus providing for proper lubrication of said mold blade.

3. In a slug mold for use in casting machines, front and rear cheek pieces, tapered point blocks secured between the ends of said cheek pieces, one of said point blocks being of greater average thickness than the other thus providing a tapered mold cavity having straight sides, a mold blade receiving channel between said cheek pieces and below said point blocks, a mold blade slidably received in said channel, a wall of said channel being relieved from a point adjacent one end of the mold cavity to the adjacent end of the cheek pieces thus providing parallel bearing surfaces for said mold blade whereby said mold blade is supported for free sliding 76v Jnovement in said channel. oil grooves in the inner surfaces of said cheekV pieces, laterally disposed grooves in the bottom surfaces of said cheek pieces and communicating with said oil grooves and vent grooves in the outer surfaces of said cheek pieces communicating with said lateral grooves whereby the oil receiving space is vented to the atmosphere thus providing for proper lubrication of said mold blade.

4. In a slug mold for use in casting machines, front and rear cheek pieces, tapered point blocks disposed between said cheek pieces, the average thickness of one point block being greater than that of the other thus providing a tapered mold cavity, a mold blade receiving channel between said cheek pieces, a mold blade slidably received in said. channel, a wall of said channel being relieved thus providing parallel bearing surfaces for said mold blade whereby said mold blade is supported for free sliding movement in said channel, oil grooves in the inner surfaces of said cheek pieces, grooves in the bottom surfaces of said cheek pieces and communicating with said oil grooves, and vent grooves in the outer surfaces of said cheek pieces communicating with said bottom grooves whereby the oil receiving space is vented thus providing for proper lubrication of said mold blade.

5. In a slug mold for use in casting machines, front and rear cheek pieces, means disposed between said cheek pieces constructed and arranged to provide a tapered mold cavity having straight sides, a mold blade receiving channel between said cheek pieces, a mold blade slidably received in said channel, means providing parallel bearing surfaces for said mold blade whereby said mold blade is supported for free vsliding movement in said channel, oil grooves in said cheek pieces, grooves disposed in the bottom surfaces of said cheek pieces and communicating with said oil grooves, and vent grooves communieating with said bottom grooves whereby the oil receiving space is vented, thus providing for proper lubrication of said mold blade.

6. In a slug mold for4 use in casting machines, front and rear cheek pieces, point blocks secured between said cheek pieces, a mold blade receiving channel between said cheek pieces, a mold blade slidably received in said channel, inclined oil grooves in the inner surfaces of said cheek pieces, laterally disposed grooves in the bottom surface of said cheek pieces and communicating with said oil grooves and inclined vent grooves in the outer surfaces of said cheek pieces communicating with said lateral grooves whereby the oil receiving space is vented to the atmosphererthus providing for proper lubrication of said mold blade.

7. In a slug mold for use in casting machines, front and rear cheek pieces, point blocks secured between said cheek pieces, a mold blade receiving channel between said cheek pieces, a mold blade slidably received in said channel, oil

grooves in the inner surfaces of said cheel; pieces, laterally disposed grooves in the bottom surfaces of said cheek pieces and communicating with said oil grooves and vent grooves in the outer surfaces of said cheek pieces communicating with said lateral grooves whereby the oil receiving space is vented to the atmosphere thus providing for proper lubrication of said mold blade.

8. In a slug mold for use in casting machines, front and rear cheek pieces, point blocks disposed between said cheek pieces, a mold blade receiving channel between said cheek pieces, a mold blade slidably received in said channel, oil grooves in said cheek pieces, grooves disposed in the bottom surfaces of said cheek pieces and communicating with said oil grooves and vent grooves communicating with said bottom grooves whereby the oil receiving space is vented thus providing for proper lubrication of said mold blade.

9. In a slug mold for use in casting machines, front and rear cheek pieces, identically tapered right and left point blocks secured between the ends of said cheek pieces, the right point block being of greater average thickness than the left point block thus providing a mold cavity having longitudinally tapered straight sides, a mold blade receiving channel between said cheek pieces and below said point blocks, a mold blade reciprccably received in said channel, a wall of said channel being relieved from a point adjacent one end of the mold cavity to the adjacent end of the cheek pieces thus providing parallel bearing surfaces for said mold blade whereby said blade is supported for free sliding movement in said channel, inclined oil grooves in the inner surfaces of said cheek pieces, laterally disposed grooves on the bottom surfaces of said cheek pieces and communicating with said oil grooves, inclined vent grooves in the outer surfaces of said cheek pieces communicating with said lateral grooves whereby the oil receiving space is vented to the atmosphere thus providing for proper lubrication of said mold blade, and a lateral oil groove disposed in the bottom surface of said mold blade and communicating with the inclined grooves in the inner surfaces of said cheek pieces each time that said mold blade is reciprocated.

MAURICE H. HARTZELL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,024,512 Knight et al Apr. 30, 1912 1,222,415 Knight Apr. 10, 1917 1,581,125 Indahl Apr. 20, 1926 1,881,298 Sandrinelli Oct. 4, 1932 

